I've got 15 computers plugged into my switch all using the same internet connection, also plugged into the switch.  The cable modem provides the DHCP addresses for the 15 computers.  I'd like to segregate the computers so they cannot talk to each other, but can still get to the internet.  It seems like I should be able to do this with VLANs, but I'm pretty new to managed switches and I'm having trouble figuring out the configuration.  I've got a PowerConnect 3524.  Thanks.